Russian scientists discover 20 small sinkholes surrounding a larger crater in Siberia.
Permafrost in Alaska's iconic Denali National Park and other areas could all but disappear by the end of this century, new research suggests.
The mammoth found in the Siberian permafrost contains the only mostly intact mammoth brain known to science and has been described in a new study.
What created the mysterious giant holes found in Siberia, and could they appear anywhere in the United States?
A mysterious giant virus buried for 30,000 years in Siberian permafrost has been resurrected.
Scientists have come up with the first detailed estimates of the amount of carbon that thawing permafrost will add to the atmosphere in the years ahead: hundreds of billions of tons.